CN211855491U - Multi-path alternating current liquid level detection relay - Google Patents
Multi-path alternating current liquid level detection relay Download PDFInfo
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- CN211855491U CN211855491U CN202020468981.3U CN202020468981U CN211855491U CN 211855491 U CN211855491 U CN 211855491U CN 202020468981 U CN202020468981 U CN 202020468981U CN 211855491 U CN211855491 U CN 211855491U
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- liquid level
- probe
- level detection
- transformer
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Abstract
The utility model discloses a multi-path alternating current detection liquid level relay, which comprises a main power supply circuit and at least one liquid level detection module circuit, wherein a plurality of liquid level detection module circuits are arranged; the main power supply circuit comprises a transformer, a rectifier bridge stack and a voltage stabilizing block, an alternating current voltage source is connected to a primary side of the transformer through a fuse and then generates mutually isolated alternating current voltages at two secondary sides, and one secondary side is connected with the liquid level detection module and serves as a probe alternating current signal source of the liquid level detection module; and the other secondary is connected with the voltage stabilizing block through a rectifier bridge stack, a filter capacitor and a voltage stabilizing block in sequence and provides stable direct-current voltage for the liquid level detection module circuit. The utility model aims at providing a probe material requires lowly, difficult oxidation, detects the accuracy, and low cost's multichannel exchanges detects liquid level relay.
Description
Technical Field
The utility model belongs to the liquid level detection field, concretely relates to multichannel alternating-current detection liquid level relay.
Background
At present, a liquid level detection relay basically has two forms on a circuit structure, one is that direct current voltage is added on two probes, when the two probes touch liquid, the probes can pass very small current, and the current pushes the relay to act through a triode circuit. However, the voltage applied on the circuit probe has no polarity change, and the surface of the probe is easily oxidized after working for a period of time, so that the quality requirement on the probe material is high, and the circuit probe is particularly not suitable for the detection of chemical liquid.
The other is that high-frequency alternating voltage is applied on the probe, the voltage polarity on the probe is kept in a changing state all the time, the surface oxidation and reduction reaction is performed alternately, the surface of the probe can be always clean, and the detection sensitivity is ensured.
The relay for detecting the liquid level adopted in the prior art is not suitable for the condition that a plurality of different liquid levels need to be detected simultaneously due to the limitations of high cost and high requirements on the used materials.
SUMMERY OF THE UTILITY MODEL
In order to solve the deficiencies in the prior art, the utility model aims at providing a probe material requires to hang down, difficult oxidation, detects the accuracy, low cost's multichannel AC detection liquid level relay.
In order to realize the purpose, the utility model discloses a technical scheme be:
a multi-path alternating current detection liquid level relay comprises a main power supply circuit and at least one liquid level detection module circuit, wherein the main power supply circuit comprises a transformer, a rectifier bridge stack and a voltage stabilizing block, an alternating current voltage source is connected to a primary side of the transformer through a fuse, two secondary sides generate mutually isolated alternating current voltages, and one of the secondary sides is connected with a liquid level detection module and is used as a probe alternating current signal source of the liquid level detection module; and the other secondary is connected with the voltage stabilizing block through a rectifier bridge stack, a filter capacitor and a voltage stabilizing block in sequence and provides stable direct-current voltage for the liquid level detection module circuit.
Preferably, a power indication circuit is connected in parallel to the primary side of the transformer, the power indication circuit includes a first light emitting diode and a first resistor, and the first light emitting diode and the first resistor are connected in series and then connected in parallel to the primary side of the transformer.
Preferably, the rectifier bridge stack comprises a first diode, a second diode, a third diode and a fourth diode, one end of the secondary of the transformer is respectively connected with the anode of the first diode and the cathode of the second diode, the other end of the secondary of the transformer is respectively connected with the cathode of the third diode and the anode of the fourth diode, the cathode of the first diode is connected with the cathode of the fourth diode and then connected with the input end of the voltage stabilizing block, and the anode of the second diode is connected with the anode of the third diode and then grounded; the output end of the voltage stabilizing block is connected with the positive end of the direct-current voltage; the filter capacitor comprises a first capacitor and a second capacitor, one pole of the first capacitor is connected to the input end of the voltage stabilizing block, one pole of the second capacitor is connected to the output end of the voltage stabilizing block, and the grounding end of the voltage stabilizing block is connected with the other pole of the first capacitor and the other pole of the second capacitor and then grounded.
Preferably, the liquid level detection module circuit comprises a first probe and a second probe which are arranged in the liquid tank and used for detecting the liquid level, and the first probe is higher than the second probe in the horizontal height; one end of a secondary side of the transformer connected with the liquid level detection module is connected with the first probe, and the other end of the secondary side of the transformer is grounded; the second probe is respectively connected with one end of a second resistor and the anode of a fifth diode, the other end of the second resistor is grounded, the cathode of the fifth diode is connected with one end of a third resistor, the other end of the third resistor is respectively connected with the anode of a third capacitor and the base of a first triode, the cathode of the third capacitor is grounded, the emitter of the first triode is connected with the base of the second triode, the emitter of the second triode is grounded, the collector of the second triode is connected with the collector of the first triode and then connected with the anode of a sixth diode, the cathode of the sixth diode is connected with the anode of a direct-current voltage, an indicating circuit formed by connecting the second light-emitting diode and a fourth resistor in series is connected with the two ends of the sixth diode, and the cathode of the second light-emitting diode is connected with the anode of the sixth diode; and two ends of a normally open contact of the miniature relay are used as signal output ends to be connected with an external PLC.
The utility model discloses the beneficial effect who has does:
1. compared with the prior art, the utility model connects the 9V alternating current on the probe, so that the voltage polarity of the probe is always in a changing state, the surface oxidation and reduction reaction of the probe are rapidly and alternately carried out, and the surface of the probe is always clean; simultaneously because the voltage that passes through on the probe is low, the low cost of whole device, the material requirement to itself of probe is not high moreover, makes the utility model discloses more economical and practical more is fit for the market demand.
2. The normally open contact both ends of miniature relay connect outside PLC as signal output part, can export the liquid level signal that the probe detected to outside detecting system, through linking up with PLC, constitute a quick reliable detection execution system.
Drawings
Fig. 1 is a circuit diagram of the main power supply circuit of the present invention;
fig. 2 is a circuit diagram of the liquid level detection module circuit of the present invention.
Detailed Description
The multi-path alternating current detection liquid level relay shown in fig. 1-2 comprises a main power supply circuit and a plurality of liquid level detection module circuits, wherein when the number of the liquid level detection module circuits is multiple, the plurality of liquid level detection module circuits are arranged in parallel; the main power supply circuit comprises a transformer T1, a rectifier bridge stack and a voltage stabilizing block, an alternating current 220V voltage source is connected to a primary side of a transformer T1 through a fuse F1 and then generates 9V and 15V alternating current voltages which are isolated from each other on two secondary sides, wherein the 9V secondary side is connected with the liquid level detection module and is used as a probe alternating current signal source TZ of the liquid level detection module; the other 15V secondary is connected with an input end Vin of a voltage stabilizing block U1 (adopting L7812) through a rectifier bridge, the input end Vin and an output end Vout of the voltage stabilizing block U1 are respectively connected with filter capacitors C1 and C2, the other ends of the filter capacitors C1 and C2 and a ground end GND of the voltage stabilizing block U1 are grounded, and the output end Vout of the voltage stabilizing block U1 is connected with a positive electrode end of 12V direct-current voltage to provide stable 12V direct-current voltage for the liquid level detection module circuit. Compared with the prior art, the utility model connects the 9V alternating current on the probe, so that the voltage polarity of the probe is always in a changing state, the surface oxidation and reduction reaction of the probe are rapidly and alternately carried out, and the surface of the probe is always clean; simultaneously because the voltage that passes through on the probe is low, the low cost of whole device, the material requirement to itself of probe is not high moreover, makes the utility model discloses more economical and practical more is fit for the market demand.
The primary side of the transformer T1 is connected in parallel with a power indicating circuit, and the power indicating circuit comprises a first light emitting diode LED1 and a first resistor R1 which are connected in series, wherein the resistance value of the first resistor R1 is 200K.
The bridge rectifier includes a first diode D1, a second diode D2, a third diode D3, and a fourth diode D4, wherein the first diode D1, the second diode D2, the third diode D3, and the fourth diode D4 may all adopt the 1N4007 specification. One end of a secondary 15V of the transformer T1 is respectively connected with the anode of the first diode D1 and the cathode of the second diode D2, the other end of the secondary 15V is respectively connected with the cathode of the third diode D3 and the anode of the fourth diode D4, the cathode of the first diode D1 is connected with the cathode of the fourth diode D4 and then connected with the input end of the voltage stabilizing block U1, and the anode of the second diode D2 is connected with the anode of the third diode D3 and then grounded.
The liquid level detection module circuit comprises a first probe A and a second probe B which are arranged in the liquid tank and used for detecting the liquid level, wherein the level of the first probe A is higher than that of the second probe B. One end of the secondary 9V of the transformer T1 is connected with the first probe A, and the other end is grounded; the second probe B is respectively connected with one end of a second resistor R2 and the anode of a fifth diode D5, the other end of the second resistor R2 is grounded, the cathode of the fifth diode D5 is connected with one end of a third resistor R3, the other end of the third resistor R3 is respectively connected with the anode of a third capacitor C3, the base electrode of the first triode Q1 is connected, the negative electrode of the third capacitor C3 is grounded, the emitter electrode of the first triode Q1 is connected with the base electrode of the second triode Q2, the emitter electrode of the second triode Q2 is grounded, the collector electrode of the second triode Q2 is connected with the collector electrode of the first triode Q1 and then connected with the positive electrode of the sixth diode D6, the negative electrode of the sixth diode D6 is connected with the positive electrode end of 12V direct-current voltage, an indicating circuit formed by the second light-emitting diode LED2 and the fourth resistor R4 in series connection is connected with the two ends of the sixth diode D6, and the negative electrode of the second light-emitting diode LED2 is connected with the positive electrode of the sixth diode D6. Sixth diode D6 both ends still are connected with miniature relay JDQ 1's coil, and miniature relay JDQ 1's normally open contact both ends connect outside PLC as signal output part, can export the liquid level signal that the probe detected outside detecting system, through linking up with PLC, constitute a quick reliable detection actuating system. The resistance values of the second resistor R2 and the third resistor R3 are 20K, the resistance value of the fourth resistor R4 is 10K, the specifications of the fifth diode D5 and the sixth diode D6 are 1N4007, the specification of the third capacitor C3 is 10U/16V, and the models of the first triode Q1 and the second triode Q2 can be 9014.
Use the utility model discloses in time, probe alternating current signal source TZ can be in proper order through the liquid of first probe A and liquid tank, second probe B and resistance R2 constitute an alternating current loop, when the liquid position reached first probe A, liquid will pass through alternating current, liquid resistance and resistance R2 are in series connection partial pressure state, alternating voltage that the partial pressure obtained obtains pulsation direct current voltage after diode D5 half-wave rectification, this voltage is through the current-limiting of third resistance R3, third electric capacity C3 filtering adds to by first triode Q1, on the base of the compound pipe that second triode Q2 is constituteed, promote the action of direct current 12V miniature relay JDQ1, miniature relay JDQ1 contact will be closed.
If the liquid level does not reach the position of the first probe A, the divided voltage becomes very low, the micro relay JDQ1 cannot be pushed to act, and the contact of the micro relay JDQ1 is in an open state.
When the liquid in the liquid tank is conductive, the quality of the liquid is not affected, and the electrochemical reaction on the surface of the probe is minimized.
Claims (4)
1. The utility model provides a multichannel exchanges and detects liquid level relay which characterized in that: the liquid level detection circuit comprises a main power supply circuit and at least one liquid level detection module circuit, wherein the main power supply circuit comprises a transformer, a rectifier bridge stack and a voltage stabilizing block, an alternating current voltage source is connected to a primary side of the transformer through a fuse, two secondary sides of the transformer generate mutually isolated alternating current voltages, and one of the secondary sides is connected with the liquid level detection module and is used as a probe alternating current signal source of the liquid level detection module; and the other secondary is connected with the voltage stabilizing block through a rectifier bridge stack, a filter capacitor and a voltage stabilizing block in sequence and provides stable direct-current voltage for the liquid level detection module circuit.
2. The multi-channel ac detection level relay of claim 1, wherein: the primary side of the transformer is connected with a power supply indicating circuit in parallel, the power supply indicating circuit comprises a first light emitting diode and a first resistor, and the first light emitting diode and the first resistor are connected in series and then connected in parallel on the primary side of the transformer.
3. The multi-channel ac detection level relay of claim 1, wherein: the rectifier bridge stack comprises a first diode, a second diode, a third diode and a fourth diode, one end of a secondary of the transformer is respectively connected with the anode of the first diode and the cathode of the second diode, the other end of the secondary of the transformer is respectively connected with the cathode of the third diode and the anode of the fourth diode, the cathode of the first diode is connected with the cathode of the fourth diode and then connected with the input end of the voltage stabilizing block, and the anode of the second diode is connected with the anode of the third diode and then grounded; the output end of the voltage stabilizing block is connected with the positive end of the direct-current voltage; the filter capacitor comprises a first capacitor and a second capacitor, one pole of the first capacitor is connected to the input end of the voltage stabilizing block, one pole of the second capacitor is connected to the output end of the voltage stabilizing block, and the grounding end of the voltage stabilizing block is connected with the other pole of the first capacitor and the other pole of the second capacitor and then grounded.
4. The multi-channel ac detection level relay of claim 3, wherein: the liquid level detection module circuit comprises a first probe and a second probe which are arranged in the liquid tank and used for detecting the liquid level, and the horizontal height of the first probe is higher than that of the second probe; one end of a secondary side of the transformer connected with the liquid level detection module is connected with the first probe, and the other end of the secondary side of the transformer is grounded; the second probe is respectively connected with one end of a second resistor and the anode of a fifth diode, the other end of the second resistor is grounded, the cathode of the fifth diode is connected with one end of a third resistor, the other end of the third resistor is respectively connected with the anode of a third capacitor and the base of a first triode, the cathode of the third capacitor is grounded, the emitter of the first triode is connected with the base of the second triode, the emitter of the second triode is grounded, the collector of the second triode is connected with the collector of the first triode and then connected with the anode of a sixth diode, the cathode of the sixth diode is connected with the anode of a direct-current voltage, an indicating circuit formed by connecting the second light-emitting diode and a fourth resistor in series is connected with the two ends of the sixth diode, and the cathode of the second light-emitting diode is connected with the anode of the sixth diode; and two ends of a normally open contact of the miniature relay are used as signal output ends to be connected with an external PLC.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020468981.3U CN211855491U (en) | 2020-04-02 | 2020-04-02 | Multi-path alternating current liquid level detection relay |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020468981.3U CN211855491U (en) | 2020-04-02 | 2020-04-02 | Multi-path alternating current liquid level detection relay |
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| Publication Number | Publication Date |
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| CN211855491U true CN211855491U (en) | 2020-11-03 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202020468981.3U Active CN211855491U (en) | 2020-04-02 | 2020-04-02 | Multi-path alternating current liquid level detection relay |
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| CN (1) | CN211855491U (en) |
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- 2020-04-02 CN CN202020468981.3U patent/CN211855491U/en active Active
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